Abstract
The author intended to study how the contraction of the puerperal uterus varies with the climatometeorological changes. For this purpose, the climate and the weather of Japanese Islands (especially Tokyo district) were classified into 4groups by Arakawa's method : namely, Siberian, Yangtze, Okhotsk, and Ogasawara air masses, and each group was further divided into 4 parts, namely under the influences of High, Low, stagnant Front and others.
Among all parturitions at San-iku Kai Hospital (Tokyo) in 1950-1951, 2466 primiparae and 2484 multiparae who had normal puerperal courses were selected. The degree of the contraction was represented by the length of the uterus fundus.
The contraction of puerperal uterus under each climato meteorological condition was investigatedstochastically.
The result obstained is summarised as follows :
1. Under the influences of Low the contraction is fast.
2. Under the influences of High the contraction is generally slow. As to the seasonal differences, it is faster in winter (Siberian air mass), slower in summer (Ogasawara air mass) and moderate in spring, autumn and the rainy season (Yangtze and Okhotsk air masses).
This finding indicates the essential and representative seasonal variations of the puerperal uterus contraction.
3. Under the influences of stagnant Front the contraction is moderate.
4. When the air masses were compared with each other by disregarding meteorological conditions, the contraction is fast in spring and autumn (Yangtze air mass), slow in summer (Ogasawara air mass) and moderate in winter and rainy season (Siberian and Okhotsk air masses).
Here, the finding indicates the average seasoaal variation of the puerperal uterus contraction.
Finally, the influences of climato-meterological changes on the contraction of puerperal uterus were discussed in relation with the autonomic nervous system and posterior pituitary hormones.
